I've been struggling on the BP and I think I could use a look at my form. Maybe (in other words, almost guaranteed) I'm doing something wrong. These were 155# and 160#. I keep hitting a wall around 160lb.
Good point on the collars-I usually don't use them on BP but now that you point it out, I wasn't paying attention and put them on out of habit (from other lifts).
Like Karl says, use some authority when you unrack the bar. You're babying it off as though you are saying, "Oh Mr. Barbell, please don't be too heavy so you don't crush me!" Lift that fucker off like a gorilla and make it your bitch!
I know what it's like to hit a bench press wall. Overall, the form looks pretty good though. Like Matt Reynolds says, sometimes you have to eat through the sticking points.